Pyband: add message delegate

CHANGELOG_UNRELEASED.md

@@ -81,6 +81,7 @@
 
 ### Helpers
 
+- (impv) [\#2835](https://github.com/bandprotocol/bandchain/pull/2835) pyband: Add msg delegate
 - (impv) [\#2830](https://github.com/bandprotocol/bandchain/pull/2830) pyband: Add msg send
 - (impv) [\#2826](https://github.com/bandprotocol/bandchain/pull/2826) pyband: Add Pyband test on Github Action
 - (impv) [\#2807](https://github.com/bandprotocol/bandchain/pull/2807) pyband: Refactor and wrote tests for client and send tx

helpers/pyband/pyband/message.py

@@ -91,3 +91,28 @@ def validate(self) -> bool:
             coin.validate()
 
         return True
+
+
+@dataclass
+class MsgDelegate(Msg):
+    delegator_address: Address
+    validator_address: Address
+    amount: Coin
+
+    def as_json(self) -> dict:
+        return {
+            "type": "cosmos-sdk/MsgDelegate",
+            "value": {
+                "delegator_address": self.delegator_address.to_acc_bech32(),
+                "validator_address": self.validator_address.to_val_bech32(),
+                "amount": self.amount.as_json(),
+            },
+        }
+
+    def get_sender(self) -> Address:
+        return self.delegator_address
+
+    def validate(self) -> bool:
+        self.amount.validate()
+
+        return True

helpers/pyband/tests/message_delegate_test.py

@@ -0,0 +1,47 @@
+import pytest
+from pyband.data import Coin
+from pyband.message import MsgDelegate
+from pyband.wallet import Address
+
+
+def test_msg_delegate_creation_success():
+    msg_delegate = MsgDelegate(
+        delegator_address=Address.from_acc_bech32(
+            "band1jrhuqrymzt4mnvgw8cvy3s9zhx3jj0dq30qpte"
+        ),
+        validator_address=Address.from_val_bech32(
+            "bandvaloper1j9vk75jjty02elhwqqjehaspfslaem8pr20qst"
+        ),
+        amount=Coin(amount=1000000, denom="uband"),
+    )
+
+    assert msg_delegate.validate() == True
+
+    assert msg_delegate.as_json() == {
+        "type": "cosmos-sdk/MsgDelegate",
+        "value": {
+            "delegator_address": "band1jrhuqrymzt4mnvgw8cvy3s9zhx3jj0dq30qpte",
+            "validator_address": "bandvaloper1j9vk75jjty02elhwqqjehaspfslaem8pr20qst",
+            "amount": {"amount": "1000000", "denom": "uband"},
+        },
+    }
+
+    assert (
+        msg_delegate.get_sender().to_acc_bech32()
+        == "band1jrhuqrymzt4mnvgw8cvy3s9zhx3jj0dq30qpte"
+    )
+
+
+def test_msg_delegate_coin_fail():
+    msg_delegate = MsgDelegate(
+        delegator_address=Address.from_acc_bech32(
+            "band1jrhuqrymzt4mnvgw8cvy3s9zhx3jj0dq30qpte"
+        ),
+        validator_address=Address.from_val_bech32(
+            "bandvaloper1j9vk75jjty02elhwqqjehaspfslaem8pr20qst"
+        ),
+        amount=Coin(amount=-1000000, denom="uband"),
+    )
+
+    with pytest.raises(ValueError, match="Expect amount more than 0"):
+        msg_delegate.amount.validate()